TruthVariables.cxx

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/*
  Copyright (C) 2002-2024 CERN for the benefit of the ATLAS collaboration
*/
 
#include "MuonPRDTest/TruthVariables.h"
 
#include "AtlasHepMC/GenEvent.h"
#include "AtlasHepMC/GenVertex.h"
namespace MuonPRDTest {
    TruthVariables::TruthVariables(MuonTesterTree& tree, const std::string& container_name, MSG::Level msglvl) :
        PrdTesterModule(tree, "TruthTestModule", msglvl), m_key{container_name} {}
    bool TruthVariables::declare_keys() { return declare_dependency(m_key); }
 
    bool TruthVariables::fill(const EventContext& ctx) {
        SG::ReadHandle<McEventCollection> truthContainer{m_key, ctx};
        if (!truthContainer.isValid()) {
            ATH_MSG_FATAL("Failed to retrieve container " << m_key.fullKey());
            return false;
        }
        unsigned int truth_vertices{0}, truth_parts{0};
        for (auto it : *truthContainer) {
            const HepMC::GenEvent* subEvent = it;
            for (const auto& vertex : subEvent->vertices()) {
                m_Truth_vertex.push_back(vertex->position());
                m_Truth_vertexId.push_back(vertex->status());
                ++truth_vertices;
            }
            for (const auto& particle : subEvent->particles()) {
                m_truthParticleP4.push_back(particle->momentum());
                m_Truth_particlePdg_id.push_back(particle->pdg_id());
                m_Truth_particleStatus.push_back(particle->status());
                m_Truth_particleBarcode.push_back(HepMC::barcode(particle));
                auto production_vertex = particle->production_vertex();
                m_Truth_particleProduction_vertex_id.push_back(production_vertex ? production_vertex->status() : -1);
                auto end_vertex = particle->end_vertex();
                m_Truth_particleEnd_vertex_id.push_back(end_vertex ? end_vertex->status() : -1);
                ++truth_parts;
            }            
 
        }
        m_Truth_nVertices = truth_vertices;
        m_Truth_nParticles = truth_parts;
        return true;
    }
}  // namespace MuonPRDTest